While T-Mobile’s already opened the floodgates for preordering the MyTouch 4G Slide from them, you can get it a bit cheaper if you don’t mind going through third party channels. Walmart is offering the device for preorder, as well, and they’re willing to let it go for $100 after a two-year contract, no rebates required. Put your order for one in now and look forward to it on July 27th. [via Cellphonesignal]